java去除字符串第一个字符

public class Main {
    public static void main(String[] args) {
        String str = "Hello";
        String result = str.substring(1);
        System.out.println(result);  // 输出: ello
    }
}

public class Main {
    public static void main(String[] args) {
        String str = "Hello";
        StringBuilder sb = new StringBuilder(str);
        sb.deleteCharAt(0);  // 删除第一个字符
        String result = sb.toString();
        System.out.println(result);  // 输出: ello
    }
}

public class Main {
    public static void main(String[] args) {
        String str = "Hello";
        String result = str.replaceAll("^.", "");  // 使用正则表达式匹配并替换第一个字符
        System.out.println(result);  // 输出: ello
    }
}

public class Main {
    public static void main(String[] args) {
        String str = "";
        if (str.length() > 0) {
            String result = str.substring(1);
            System.out.println(result);
        } else {
            System.out.println("字符串为空");
        }
    }
}